291 ME. P. H. GOSSE ON THE CLASPING-OKGAN> 



into full square view (as in PL XXVII. fig. 13), the serration of the edge is seen to be 

 very fine, and slightly irregular. Its base has a remarkable upturned lobe. 



Tbe form of this organ may be well imitated, and illustrated, by cutting a paper 

 pattern into the shape of fig. II, and rolling it into a tube, of which the dotted line is the 

 longitudinal direction. If then it be pulled gently open, it will assume the exact curva- 

 ture of the harpe. The long oblique point at the lower end of fig. 14 is, in situ, upcurved, 

 and appressed to one of the flattened knobs which occupy the floor of the abdominal 

 cavity. The expanse of the harpe resembles clear yellow glass, intensified into nearly 

 black at the edges all round. 



The uncus is of regular curvature, about one fourth of a circle, moderately slender, 

 black, polished, coming down just between the two shell-like harpes. It is closely em- 

 braced by the lateral lobes of the scaphium, in which I sec no bristle-bearing crest, and 

 no " double teeth." But the upper edges arc pilose, with short, stiff, close, shining hair, 

 pointing towards the dorsal surface of the abdomen, as is usually the case with those 

 species of Ornitlwptera which have not aristatc crests. 



The penis is a moderately thick red-brown column, which protrudes from the midst of I 

 the eighth segment into the midst of the genital cavity, curving upward, nearly to tin 1 

 tip of the uncus. It is obliquely truncate at the point, where (in the specimen cxainined) 

 there was what had the appearance of a glans, surrounded by a preputial thickening. 

 But this is, indeed, so much like the remarkable appearance described and figured in 

 O. Haliphron (see p. 285 supra) that I am inclined to refer it to the same origin — as if the 

 pulpy substance that (at times) occupies the interior of the penis had been forcibly pushed 

 out from within, against the underside of the scaphium. Here, however, the walls of the 

 penis had not been burst, as there ; the orifice was not sensibly trumpet-mouthed ; and 

 there was no other trace discernible of the pulpy matter. The mass in question, more- 

 over, instead of being white, was dull brown. Possibly, these features may indicate that 

 the extrusion had not been very recent. The organ is reversed. 



The two projecting knobs of hard polished chitine, which serve as ancillary supports 

 for the bases of the valves and harpes, are large and conspicuous. The use of the knobs 

 admitted of no doubt, as I, slowly and gradually, removed one of the valves *. 



Papilio Memnon, Linn. (Plate XXVIII. figs. 1-3.) [Cram. i. 91. c— Borneo.] 



T'alce-outlme ovate, obliquely truncate at base ; edge narrowly turned-in, or forming a 

 narrow shelf fringed with short spare hairs ; interior floor smooth, but not polished. 



Harpe, a narrow blade of dark polished chitine, which, springing from the base of the! 

 valve, runs close to the edge of the shelf, all along the ventral margin, to the very point, | 

 where it ends abruptly. This long blade may be compared to a knife affixed by its back 

 to the lining membrane of the valve, but sloping inward, its free edge having several 

 excavations in its outline ; the organic adhesion of the lower edge is, moreover, lacking 

 for the terminal fourth of its course. 



This blade can, without much difficulty, be lifted out of the valve, the basal mem- 

 brane yielding to force. The outline now can be more correctly perceived. At PL XXVIII. 



* For further notes on this species see Appendix. 



